The first crossover will move southbound highway traffic onto the northbound side of the road for one week, until May 23. Northbound highway traffic will move onto the southbound side of the road beginning the night of June 3; this crossover will be in effect through June 6.

The crossovers will take place overnight, between the hours of 9 p.m. and 5 a.m.

During the crossover times:

? Access to Dunbarton Road and San Juan Road from 101 will be prohibited-motorists are advised to use San Miguel Canyon.

? Access to Highway 101 from San Juan Road will be prohibited - motorists are advised to use San Miguel Canyon.

? Electronic message signs will be in place on Highway 101 to give drivers advance notice about the changes.

? CHP will be assisting with traffic control.

The traffic crossovers are necessary to allow drainage work on both sides of Highway 101 to be done more safely and efficiently.